Ogre Scene Renderer - 如何将一个可渲染对象加进渲染队列

判断对象是否半透明实体

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//-----------------------------------------------------------------------
bool Pass::isTransparent(void) const
{
// Transparent if any of the destination colour is taken into account
if (mDestBlendFactor == SBF_ZERO &&
mSourceBlendFactor != SBF_DEST_COLOUR &&
mSourceBlendFactor != SBF_ONE_MINUS_DEST_COLOUR &&
mSourceBlendFactor != SBF_DEST_ALPHA &&
mSourceBlendFactor != SBF_ONE_MINUS_DEST_ALPHA)
{
return false;
}
else
{
return true;
}
}

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//-----------------------------------------------------------------------
void RenderPriorityGroup::addRenderable(Renderable* rend, Technique* pTech)
{
// Transparent and depth/colour settings mean depth sorting is required?
// Note: colour write disabled with depth check/write enabled means
// setup depth buffer for other passes use.

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// <strong>这个很长的if决定对象是否半透明实体</strong>
if (pTech->isTransparentSortingForced() ||
(pTech->isTransparent() &&
(!pTech->isDepthWriteEnabled() ||
!pTech->isDepthCheckEnabled() ||
pTech->hasColourWriteDisabled())))
{
if (pTech->isTransparentSortingEnabled())
addTransparentRenderable(pTech, rend);
else
addUnsortedTransparentRenderable(pTech, rend);
}
else
{
if (mSplitNoShadowPasses &&
mParent->getShadowsEnabled() &&
(!pTech->getParent()->getReceiveShadows() ||
rend->getCastsShadows() && mShadowCastersNotReceivers))
{
// Add solid renderable and add passes to no-shadow group
addSolidRenderable(pTech, rend, true);
}
else
{
if (mSplitPassesByLightingType && mParent->getShadowsEnabled())
{
addSolidRenderableSplitByLightType(pTech, rend);
}
else
{
addSolidRenderable(pTech, rend, false);
}
}
}

}

每一个RenderPriorityGroup由6个队列组成

+ mSolidsBasic {msRadixSorter1={...} msRadixSorter2={...} mOrganisationMode='
' ...} Ogre::QueuedRenderableCollection

+ mSolidsDiffuseSpecular {msRadixSorter1={...} msRadixSorter2={...} mOrganisationMode='
' ...} Ogre::QueuedRenderableCollection

+ mSolidsDecal {msRadixSorter1={...} msRadixSorter2={...} mOrganisationMode='
' ...} Ogre::QueuedRenderableCollection

+ mSolidsNoShadowReceive {msRadixSorter1={...} msRadixSorter2={...} mOrganisationMode='
' ...} Ogre::QueuedRenderableCollection

+ mTransparentsUnsorted {msRadixSorter1={...} msRadixSorter2={...} mOrganisationMode='
' ...} Ogre::QueuedRenderableCollection

+ mTransparents {msRadixSorter1={...} msRadixSorter2={...} mOrganisationMode='' ...} Ogre::QueuedRenderableCollection